Boat bailing attachment for outboard motors



Feb. 3, 1953 E. c. KIEKHAEFER BOAT BAIL-ING ATTACHMENT FOR OUTBOARD MOTORS med April v, 194s 5 Sheets-Sheet 2 ffm @wiwi BY ha .f1/M

.wrneys' Feb. 3, 1953 E. c. Klr-:KHAEFER 2,627,242

BOAT BAILING TTACHMENT FOR OUTBOARD MOTORS Filed April 7, 1948 3 Sheets-Sheet 3 Patented Feb. 3, 1 953 BOAT BAILING ATTACHMENT FOR OUTBOARD MOTORS Elmer C. Kiekhaefer, Cedarburg, Wis.

Application April 7, 1948, Serial No. 19,606

(Cl. 11S- 18) 4 Claims.

This invention relates to the exhaust systems for outboard motors as particularly applied to the bailing of boats and the like.

An object of the invention is to provide a simple, inexpensive boat bailing device which may be connected to an outboard motor for operation therewith.

Another object is to provide a boat hailing device operable in connection with operation of an outboard motor which requires the use of no mechanical operating parts, is easy to install and requires no attention or service.

Another object is to provide a boat bailing device which is automatic during the operation of the boat and requires no adjustments at any time.

These and other objects and advantages of the invention will be more fully set forth in the following description of a preferred embodiment of the invention illustrated in the accompanying drawings.

In the drawings:

Figure 1 is a vertical longitudinal sectional view `of the stern of a boat with an outboard motor attached thereto showing the hailing device in side ,elevation Fig. 2 is a detailed View of the drive shaft housing of the outboard motor with parts broken away to show the exhaust chamber therein;

Fig. 3 is an enlarged view partially sectioned similar to Fig. 2 showing an alternative embodiment of the invention;

Fig. 4 is a view similar to Fig. 1 showing the motor in the fully tilted position;

Fig. 5 is a detail section of the check valve shown in Fig. 1;

Fig. 6 is an enlarged vertical longitudinal section of the drive shaft housing supporting the engine of the outboard motor shown in Figs. 1

-and 4;

Fig. 7 is a front elevation of the housing shown `in Fig. 6;

Fig. 8 is a top plan view of the upper end of the housing shown in Fig. 6;

The outboard motor shown in the drawings includes the engine I and the hollow drive shaft housing 2 secured beneath engine I to receive the engine exhaust and discharge the same through the exhaust outlet 3.

The vertical drive shaft 4 extends from engine I within housing 2 to the lower gear housing 5 carrying the propeller B. The housing 5 carrying the propeller 6 is bolted to the lower end of drive shaft housing 2.

The bracket I with screw clamps 8 is provided for removably securing the motor to the transom 9 at the rear end of the boat I0. The swivel bracket II is pivoted horizontally at I2 to the clamp bracket l. The housing 2 is pivoted on a vertical axis to the bracket II by means of the hollow swivel pin I3 and the upper and lower lugs I 4 and I5, respectively, formed integrally with the housing 2 in the front forward edge thereof to provide for turning of the motor for steering of the boat.

The housing 2 shown in the drawings is similar to that disclosed and claimed in the cepending applications of the present inventor for Outboard Motor, led September 5, 1947, Serial No. 772,344, and for Underwater Exhaust for Outboard Motors, led January 19, 1949, Serial No. 71,592.

The housing 2 receives the exhaust of engine I through openings in its upper endv and carries the exhaust downwardly therethrough and rearwardly through exhaust conduit I6 to discharge `the same underwater through exhaust orifice 3 into the stream of the propeller. The design of the exhaust system provides an appreciable vacuum within the system for the quiet and eiiieient operation of the engine.

The invention provides means connected to housing 2 and extending through transom 9 to the bottom of the boat to drain the water from the boat and discharge the same through orifice 3, rwhereby the boat will be kept dry and substantially free of bilge water at all times.

According to the invention there is illustrated in the drawings a stand pipe II having its lower open end near the bottom of the boat and its upper end connected to the fitting I8 secured to and passing through transom 9 a substantial distance above the load water line I 9. A iiexible conduit 2l) connects fitting I8 with a fitting 2| the brackets 'I and I I and is allowed to hang nor- Vmally between the motor and boat, as shown.

The location of fitting I8 in transom 9 should be as far above the water line I9 as possible for safety. However, the fitting should not be higher from the bottom of the boat than the normal vacuum of housing 4 can lift the water from the bottom of the boat.

Preferably one end of conduit 20 should be readily detachable from fitting I8 or 2l so .as not to interfere with the removal of the motor from the boat.

An alternative means for connecting conduit 20 an-d housing 2 may be provided as shown in Fig. 3.

In this -embodiment the fitting 22 is employed to connect the conduit 20 with the lower en-d of the hol-low swivel pin I3 extending from bracket II -through the lower lug I5. The drilled passageway 23 in housing `2 registers with the slot 24 in pin I3 to provide communication between conduit 2i) zand the housing.

If desired, should the construction of the exhaust system provide an insumcient vacuum for removal of bilge water for a given height of standpipe Il at times during lthe operation of the motor, a check valve 25 may be employed at any suitable point between the mouth of standpipe II fand the housing 2 to prevent exhaust from forcing its way into the boat. Where the check valve 25 is located in the standpipe or fitting I8, it additionally prevents water from entering the boat under emergency conditions when being operated without the connection of conduit 20 to housing 2. Drive shaft housing 2 which provides an exhaust system of sufficient vacuum for removal of bilge water comprises a hollow aluminum casting having generally uniform wall thicknesses so that the interior section of the housing, as will be described, corresponds generally to the outer body of the housing. The lugs Ill and I extending forwardly of the hou-sing and formed integrally therewith receive the upper and lower ends of the swivel pin i3 carried by bracket Il for the pivotal Isupport of the motor las described for steering vof the boat.

The upper end of the housing 2 is of general dimensions substantially equal to `the corresponding dimensions of the engine crankcase 2t and cylinder block 2l of engine I to fully support the same, and is 4provided with an opening 2S registering with the lower open end of exhaust chamber 29 of the engine block to receive the. exhaust gases therefrom.A Bolts or other suitable means secure the engine i in place on the houslng..

The discharge port 3e inl .the engine block 27 opens from the water circulating system of the engine and registers with the :opening 3I in the housing to discharge the water into the upper end of the housing.

The exhaust outlet 3 is provided with the discharge opening or orice 3,2 and is located at the lower end of the housing beneath and rearwardly of the propeller anti-eavitation plate 33 to discharge the exhaust gases with the cooling water into the vortex of the propeller.

The upper end of the housing provides a chamber of substantial size immediate -to exhaust chamber 29 and in the embodiment of the invention shown in the drawings is further en- Al-arged to extend rearwardly of the engine as at 34. The forward vertical edge of the housing is preferably straight for the entire length thereof. The cross-section `of the housing moving downwardly from 'the upper end becomes immediately substantially more narrow and stream- 4lined relative to the direction of movement of the housing through the water and diminishes proportionately to a short ydistance above the waterline I9 of the housing.

The underwater part of the housing below waterline I9 extends a substantial distance rearwardly to the rear edge of plate 33 and is of particularly narrow dimensions for maximum streamlining and reduced frontal area. The lower end -piece which forms the discharge outlet 3 having the opening 32 is formed integrally with the body of the housing and should be as narrow as possible within the limitations of the inner dimensional requirements, as will be described, so that there is no increased drag of that part of .the housing. The threaded opening 35 beneath lug I5 of housing 2 is adapted to receive fitting 2I and is located adjacent to transom 9 of the boat to require conduit 2t to be of minimum length.

Housing Il provides an exhaust passage for the gases from the engine .to the underwater discharge opening of substantially uniformly decreasing cross-section. The cooling of the exhaust gases is effectively provided for by the large water-cooled surface areas of the housing particularly at the upper end thereof so that the exhaust gases immediately upon entering the housing begin a contr-action which is 4substantially uniformly continued during passage through the housing and until discharge into the stream of the propeller. The uniform contraction of the gases provides a substantially uniformly increasing velocity of flow thro-ugh the housing whereby the normal vacuum conditions obtained at the lower end thereof is extended with maximum effect up into the housing.

The exhaust gases are substantially uniformly and continuously accelerated in flow from the upper end of the drive shaft housing until they are discharged through opening 32 at the bottom. By reason of this fact the gases are drawn from the engine block rapidly so that the scavenging of the engine is more perfect and there is an increase in engine efficiency. In this respect the present invention differs greatly from former exhaust systems wherein the gases were often interrupted in flow and were accelerated in a non-uniform and, in faot, non-continuous manner so that the 4engine received very little, if any, of the advantage obtainable with the underwater discharge.

The substantial and gradual reduction in cross-sectional area of the drive shaft housing from top to bottom provides for an increase in velocity of thegases, and utilizes the contraction of the gases on cooling to eifect the final acceleration in the flow of the gases.

The contraction of the gases and the effect of the propeller slip stream past outlet 3 effects a ynegative pressure within hou-sing `2 which materially increases the performance of the engine .and which may be utilized as a pump to effect t-he bailing of the boat.

The invention provi-des an inexpensive bilge pump for use with small outboard motor boats which is simple and efficient. The IpipeV and iiexible conduit may be large enough to effect a quick bailing of small amounts of bilge water, but should not be so large as to appreciably effect the functioning of the engine exhaust when allowing air to pass into the exhaust.

Various -embodiments of the invention may be employed within the sco-pe of the accompanying claims. Y

I claim:

1. In an outboard motor adapted to be secured to the transom of a boat, the combination comprising an engine, la housing supporting said engine, a propeller carried by said housing, an exhaust chamber in said housing to receive exhaust gases directly from s-aid engine and having an underwater exhaust opening rearwardly of and adjacent said propeller whereby said chamber in the normal operation of said engine is subject to substantially les-s than atmospheric pressure, a conduit having one end open at the `bot-tom of the boat and communicating with said chamber, said conduit being adapted to extend and permitting the motor to be freely pivoted for steering and for raising from the water.

2. In a `dirigible outboard motor including a bracket adapted to be scoured to the transom of a boat, the combination comprising an engine, a housing pivotally supported by said bracket for steering, a propeller Icarried by said housing, an exhaust chamber in said housing to receive exhaust gases from said engine and having an underwater exhaust opening rearwardly of and adjacent said propeller, said chamber in the normal operation of said engine being subject to substantially less than atmospheric pressure, and a conduit from said housing adapted to extend to the bottom of the boat for automatically bailing th-e latter by the suction in said chamber.

3. In an outboard motor including a bracket adapted to be secured to the transom of a boat, the combination comprising an engine, a housing supporting said engine :and pivotally supported by said bracket for steering, a propeller carried by said housing, an exhaust chamber in said housing to receive exhaust gases from said engine and having an underwater exhaust opening rearwardly of and adjacent said propeller whereby said chamber in the normal operation of sai-d engine is subject to substantially less than atmospheric pressure, a pipe having one end open at the bottom of the boat, a condui-t fitting connected to the other end of said pipe and adapted to pass through the transom of the boat substantially above the load waterline thereof, and means connectting said pipe and fitting to said chamber and permitting the motor `to be freely pivoted for steering and for raising from the water.

4. In van outboard ymotor ladapted to be secured to the transom of a boat, the combination comprising an engine, a housing, a propeller carried beneath said housing, an exhaust lchamber in said housing to receive exhaust gases from said engine and having an underwater exhaust opening rearwardly of and adjacent said propeller whereby said chamber in the normal operation of said engine is subject to substantially less than atmospheric pressure, fa vertical pivot pin passing through lugs formed integrally with said housing and secured by means of a bracket to the transom of the boat to support th-e motor, a passageway from said chamber to the lower end of said pin, and a conduit connected to the lower end yof said pin and adapted for passing through the transom to the bottom of the boat for automatically bailing the latter by the suction in said chamber.

ELMER C. KIEKHAEFER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,072,398 Langley Sept. 2, 1913 1,234,293 Cowles July 24, 1917 1,304,961 Good May 27, 1919 2,151,225 Newton Mar. 21, 1939 2,209,301 Johnson c- July 23, 1940 2,351,050 Karey June 13, 1944 2,507,034 Martin May 9, 1950 

